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# ADV.D07 Preanalyt
# ADV.D07 - Ch.09 - Preanalystical Errors
Question | Answer |
---|---|
lipemia | milky appearing serum. Due to eating fatty meal before blood is drawn. |
Fasting should include abstinance from taking water. | False. The patient can have water. |
Probing for a vein can cause | hemolysis and release of tissue factor |
Hemolysis | the breaking of RBC |
Shaking a vacuum tube instead of gently mixing it can cause | hemolysis |
When a patient's veins are hard and occluded you should | obtain a capillary puncture |
Thrombosis | A condition in which a blood clot is in a blood vessel. |
Chlorhexidine gluconate | A skin antiseptic that can be used when the patient is allergic to iodine or alcohol. |
Stress will elevate some blood levels. These are: | WBC, glucose, hormones, fibrinogen |
diurnal rhythms | fluctuations in body fluid levels and analyte values during the day. |
Syncope | Dizzy feeling. Patients who have syncope should be in the |
supine | lying on the back with legs straight |
lymphedema | A condition of increased tissue fluid due to lymph fluid release. Occurs after a mastectomy. |
pharmacokinetics | The absorption, distribution, and action of drugs. |
TDM | Therapeutic drug monitoring |
fasting | Restriction from foods and beverages for 8 to 12 hours. Water is acceptable. |
2hr. post prandial (2hr.PP) | Blood test to be done 2 hours after a prescribed meal. |
Timed Test | One that is drawn at a specific time. May be drawn 10 minutes before or 10 minutes after the designated time (example, 3pm can be drawn at 2:50pm to 3:10pm |
tourniquet pressure elevates | Potassium (K), Cholesterol & lipids, Iron |
If the patient pumps their fist they can increase | potassium, lactate, phosphate |
Acceptable corrective actions if you do not get blood when you stick | 1. move needle slightly inward or 2. move needle slightly outward. |
petechiae | small bruising of the skin due to thrombocytopenia |
hematoma | a collection of blood under the skin due to bleeding. Can occur if you do not hold down on the puncture site. |
Hemoconcentration | build up of analytes due to reduced blood flow |
preanalytical error | Any event that alters the blood sample before the sample is tested. |
analytical error | any event that alters the blood sample during testing |
postanalytical error | any event that affects the patient results after testing is done. |
Thermolabile | temperature sensitive |
Photosensitive | sensitive to light |
Specimens that are photosensitive | bilirubin, beta-carotene, folate, porphyrins, Vitamin A, B6 and B12 |
Thermolabile specimens that require cold | ammonia, ABGs, catecholamines, gastrin, lactic acid, parathyroid hormone, pyruvate |
Thermolabile specimens that require 37C or body temperature | Cold agglutinins, cryofibrinogen, cryoglobulins |
preanalytical error | Error before testing |
analytical error | Error that occurs before testing |
lymphostasis | excess lymph fluid that forms on the side of a mastectomy |
variable | something that can change |
patient variables - Most are controllable | diet, lifestyle, exercise, posture, circadian rhythm, travel, prolonged bed rest, basal state |
environmental variables - not controllable | geographical location. For example altitude plays a role in increasing the number of RBC! |
specimen collection variables - controllable | transport method, mixing additive tubes, technique and use of proper equipment and correct tubes. |
Diet | fasting ensures a basal state for blood testing. Certain foods may also be restricted depending upon the type of test. |
turbid | Cloudiness or haziness of a fluid. lipemia creates a cloudy to milky appearance in blood. This cloudy appearance is referred to as being turbid. |
Basal State | Minimal metabolic state achieved when fasting for 8 to 12 hours. |
Fasting for 13 hours is better than 12. | False. 13 hours may dehydrate the patient. |
It is acceptable to collect a capillary sample if veins are occluded or sclerotic | TRUE. Just document the type of specimen on the requisition. |
What are acceptable patient identifiers: | name, ID#, DOB, scanned QR code on an armband |
A patient with and IV should have blood drawn. | On the other arm. If the IV side must be done, draw below the IV after turning the IV off for 2 min. |